I had thought there was something about this in the current Capital Investment Plan, but rereading it, I guess not. It includes:There's a broad consensus that supports double tracking the Old Colony Line through Dorchester by shifting the Red Line junction south of Savin Hill. That double tracking is necessary for quality service expansion and improvement to the South Shore and Cape Cod. How likely is it that such a project breaks ground within a decade? What can move the needle in that direction?
Rail Modernization Early Actions - Old Colony Double Track (P1209):
Implementation of track improvements to support hourly, all-day, bi-directional service
on the Old Colony Line and South Coast Rail. Includes design for double-tracking on
portions of the Greenbush/Middleboro Lines and track modifications at Middleboro
Station.
That project has been going on a few years, it's still in Pre-Design, and it's budgeted for $10 million. That sounds like double tracking on the branches only, and not the trunk. Maybe someone here knows the specifics of that one? Regardless, it doesn't look like double-tracking in Dorchester is on the 5-year plan.
I've heard (this forum or elsewhere, I don't remember, don't trust me) that part of the holdup was some inter-departmental turf wars: full double-tracking would inevitably mean touching some land or a wall on the Southeast Expressway, and that let MassDOT hold up the project unless they got some expensive road upgrades or highway widening. It is possible that that problem is easier to fix right now, since Eng heads both MBTA and MassDOT.
Yeah, I think that's an important part of any solution. But to be clear, that only fixes a part of the single-track problem. There'd still be a bunch of single-tracked trunk through Quincy. I know TransitMatters recommended moving the Red Line junction, and also double tracking at least Quincy Center Station (among tons of other upgrades). I wonder how much the Red Line swap would help on its own.Moving the RL junction south of Savin Hill would be the most expedient way to double track the Old Colony. It's not ideal in terms of RL train flow (as I believe F-Line previously pointed out elsewhere on aB), but in terms of funding availability and getting it done in the foreseeable future, it's more of a winner than tunneling or other investment-heavy proposals made.